A particle is moving in a straight line such that its velocity is increasing at 5 ms^{$$-$$1} per meter. The acceleration of the particle is _____________ ms^{$$-$$2} at a point where its velocity is 20 ms^{$$-$$1}.

A car is moving with speed of $$150 \mathrm{~km} / \mathrm{h}$$ and after applying the break it will move $$27 \mathrm{~m}$$ before it stops. If the same car is moving with a speed of one third the reported speed then it will stop after travelling ___________ m distance.

A car covers AB distance with first one-third at velocity v_{1} ms^{$$-$$1}, second one-third at v_{2} ms^{$$-$$1} and last one-third at v_{3} ms^{$$-$$1}. If v_{3} = 3v_{1}, v_{2} = 2v_{1} and v_{1} = 11 ms^{$$-$$1} then the average velocity of the car is _____________ ms^{$$-$$1}.

A ball is projected vertically upward with an initial velocity of 50 ms^{$$-$$1} at t = 0s. At t = 2s, another ball is projected vertically upward with same velocity. At t = __________ s, second ball will meet the first ball (g = 10 ms^{$$-$$2}).